The U.S. Federal Reserve could no longer need to raise interest rates any further sometime in 2019, Philadelphia Fed President Patrick Harker said on Thursday.

Asked if that year could be the end of the central bank's tightening cycle during an interview with broadcaster CNBC, Harker replied: Could be, yeah, it's possible."

The Fed has raised rates six times since it began a tightening cycle back in late 2015. Harker added that he sees the neutral rate as between 2.75 and 3 percent. 

"I think we're getting close to neutral," he told CNBC's Steve Liesman in a live interview from Dallas. "If we see inflation start to accelerate, then I would be open to a fourth increase this year. But I'd have to see evidence of that first."